Well, I don't know... I never even looked at calendar for a long time. To me, as long as it isn't Saturdays and Sundays, that's okay. Sometimes, though, when price moves so slowly, I check the calendar and...voila...it's bank holiday.
As for time zone....???? Does it matter which time zone you are in? Is it as if you are in time zone +5 GMT it is better for you to trade during Asian session rather than London?